refactor(k8s): Reorganize into 5-layer structure with production kustomizations

k8s/applications/dev-tools/Dockerfile

@@ -0,0 +1,31 @@
+FROM --platform=linux/amd64 ubuntu:24.04
+
+RUN apt-get update && apt-get install -y \
+    tmux \
+    curl \
+    git \
+    build-essential \
+    nodejs \
+    npm \
+    bash \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install gotty (web terminal access)
+RUN curl -sL https://github.com/sorenisanerd/gotty/releases/download/v1.5.0/gotty_linux_amd64.tar.gz | \
+    tar xz -C /usr/local/bin && chmod +x /usr/local/bin/gotty
+
+# Install Claude CLI
+RUN npm install -g claude-code-cli 2>&1 || echo "Note: Claude CLI will be available after NPM package is published"
+
+WORKDIR /root
+
+# Create persistent storage dir
+RUN mkdir -p /root/.claude /root/.config /root/.cache
+
+# Entrypoint: start tmux session and gotty
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+EXPOSE 8080
+
+ENTRYPOINT ["/entrypoint.sh"]